var express = require('express');
var path = require('path');
var favicon = require('serve-favicon');
var logger = require('morgan');
var cookieParser = require('cookie-parser');
var bodyParser = require('body-parser');

var index = require('./routes/index');
var users = require('./routes/users');
var goods = require('./routes/goods');
var ejs = require('ejs');

var app = express();

// view engine setup
app.set('views', path.join(__dirname, 'views'));
app.engine('.html', ejs.__express);
app.set('view engine', 'html');// 把视图引擎更换为html（ejs）

// uncomment after placing your favicon in /public
//app.use(favicon(path.join(__dirname, 'public', 'favicon.ico')));
app.use(logger('dev'));
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: false }));
app.use(cookieParser());
app.use(express.static(path.join(__dirname, 'public')));

/* 登录拦截 ，在该app.use执行完成后才会执行之后的app.use*/
app.use(function (req,res,next) {
  if(req.cookies.userId){// 若存在cookies则继续执行下面的app.use
    next();
  }else{
    // 当点击登录或者登出或者请求商品列表时，不拦截
    console.log(req.originalUrl);
    if(  req.originalUrl=='/users/login'
      || req.originalUrl=='/users/logout'
      || req.originalUrl.indexOf('/goods/list')>-1
    ){
      next();
    }else{
      res.json({
        status:'10001',
        msg:'当前未登录',
        result:''
      });
    }
  }
});

app.use('/', index);
app.use('/users', users);
app.use('/goods', goods);

// catch 404 and forward to error handler
app.use(function(req, res, next) {
  var err = new Error('Not Found');
  err.status = 404;
  next(err);
});

// error handler
app.use(function(err, req, res, next) {
  // set locals, only providing error in development
  res.locals.message = err.message;
  res.locals.error = req.app.get('env') === 'development' ? err : {};

  // render the error page
  res.status(err.status || 500);
  res.render('error');
});

module.exports = app;
